本文借助于DTA和X射线结构分析研究了NdCl_3-SrCl_2-NaCl三元体系相图。发现本体系内有对应于NdCl_3、NaCl、SrCl_2和Sr_3NdCl_9的四个液相面、五条二次结晶线、一个三元低共熔点E(77.0wt.％NdCl_3,22.0wt.％NaCl;432℃)和三元转熔点P(75.0wt.％NdCl_3,20.6wt.％NaCl;491℃)。同时发现有一个固相下形成的化合物(在420℃分解);并获得该相的X射线衍射数据。 In this paper, DTA and X-ray structure analysis of the NdCl_3-SrCl_2-NaCl ternary system diagram. It is found that there are four liquid phase surfaces, five secondary crystallization lines, a ternary eutectic point E (77.0wt.% NdCl_3, 22.0wt.% NaCl; 432 ℃) corresponding to NdCl_3, NaCl, SrCl_2 and Sr_3NdCl_9, And ternary transition point P (75.0 wt.% NdCl 3, 20.6 wt.% NaCl; 491 ° C). At the same time, it was found that there was a solid phase formed compound (decomposed at 420 ° C); and X-ray diffraction data of the phase were obtained.